how I make black diesel/wmo 

Great idea! That's about the best you can do, unless you put a centrifugal filter in the bank of filters.

I converted an oil furnace to burn straight filtered wmo, works great.

Good to see someone recycling old oil! Fair play to ya

Nice, thnks for sharing your setup with us.

Not sure of a cut off date per se, but older engines would likely have the most success using crankcase oil for fuel. The emission sensors and soot filtering devises om newer vehicles don't hold up well with clean sulpher-free stuff. The 2cycle Detroit Diesels would thrive on it, they used to run on raw filtered crude. Old Caterpillar and Cummins manual natural aspirated engines could handle filtered crude also, however initial starting would probably be easier on real fuel then switching after the heads got warm.

I hope to start running wmo next year. Got similar test mules. 86 jetta and a 95 dodge. Got a 55 gallon drum of heating oil that's been settling a year now. I occasionally get a few gallons of iso 32 hydraulic oil. The VW is gonna get experimented on first after a complete reseal and clutch replacement. Gonna be a 2 tank setup. Found a 6 gallon boat tank, I just need to modify the sending unit for a return line. Have you tried ATF in your volkswagen? Working on a source of ATF from the local trans shop.

Mix gasoline and E85 in with it. The ethanol drags the moisture out and the gasoline portion helps to thin the oil. I'd also boil it to help evaporate the remaining moisture and it will halve the time it takes to filter. I do run this in a common rail injection engine and there's no issues.

For your filters use house water filters, theyre cheaper to replace when they get clogged

Them oil filters may cost abit at first but worth it

You should try to get a centrifugal spring system

Minty bro

Does storing it under pressure help separate the water?

Hey can you change the colour of black diesel to yellow

Don't try this at home unless you want to ruin your truck like I did !!!!!